The seat was vacant after Republican Rep. Martha McSally decided to run for the U.S. Senate seat held by the retiring GOP Sen. Jeff Flake.

The swing district that takes in much of Democrat-heavy Tucson and more Republican areas of Cochise County was a key battleground in Democrats attempt to take back control of the U.S. House.

Kirkpatrick previously represented the 1st District during two separate stints in Congress.

District 3
The Associated Press is projecting Democratic candidate Raul Grijalva to win. According to the Secretary of State's website, Grijalva is running against GOP candidate Nicolas "Nick" Pierson.

District 4
The Associated Press is projecting GOP candidate Paul Gosar to win. According to the Secretary of State's website, Gosar is running against Democratic candidate David Brill, in a race that featured six of Gosar's siblings attacking their brother in an ad and endorsing Brill.

District 5
The Associated Press is projecting GOP candidate Andy Biggs to win. According to the Secretary of State's website, Biggs is running against Democratic candidate Joan Greene.

District 6
The Associated Press is projecting GOP candidate David Schweikert to win. According to the Secretary of State's website, Schweikert is running against Democratic candidate Anita Malik.

District 7
The Associated Press is projecting Democratic candidate Ruben Gallego to win. According to the Secretary of State's website, Biggs is running against Green Party candidate Gary Swing. There is no GOP candidate in the race.